The executor of any administrative act invalidly carries out his or her function before receiving the relevant letter and verifying its authenticity and integrity, unless previous notice of the letter had been communicated to the executor by authority of the one who issued the act.

What is this site?
CanonLaw.Ninja is a website that allows you to search canon law and other various church documents.

Is CanonLaw.Ninja up-to-date?
To the best of my knowledge, as of May 9, 2019, all of the documents on CanonLaw.Ninja are up to date. CanonLaw.Ninja includes the changes promulgated in Omnium in Mentem, Mitis Iudex Dominus Iesus, De Concordia inter Codices and Pope Francis' update to the Catechism.

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Send an email to [email protected] and I'll get back to you as soon as I can. If I can do something that would make the site more useful to you, I'd love to help!

Credits
Canons and cross-references were scraped from jgray.org. Catechism paragraphs were scraped from vatican.va. Other documents were scraped from various sources.